Iveco EUROCARGO, Instructions Manual

Page: 107 / 226

EUROCARGO Euro 6
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APPLICATIONS OF SUPERSTRUCTURES
APPLICATIONS OF SUPERSTRUCTURES
3.3 CONNECTION BETWEEN CHASSIS AND COUNTER CHASSIS
17
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Printed 603.95.747
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1st Ed. - Base 12/2013
193875
Figure 12
For the correct use of these plates, please keep in mind that:
●
the vertical rib of the chassis should be fastened only after making sure that the counter chassis is snug against the chassis itself;
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the distribution must be limited to the central and rear area of the chassis;
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the number and the thickness of the plates and the number of fixing screws must be adequate to withstand the bending mo-
ments and cutting of the section.
In cases where the superstructure generates high bending and twisting moments on the chassis and its resistant capacity should be
increased by adopting a cut-resistant connection between the chassis and the counter chassis, or if you want to contain the height
of the counter chassis as much as possible (e.g. centre axle trailers, crane on rear overhang, tail lifts, etc.), use the information sup-
plied in the table below (valid for all models):
Table 3.3
Chassis and counter chassis
height/section ratio
Max. distance between the
centre lines of the
cut-resistant plates [mm] (1)
Minimum characteristics of the plates
Thickness [mm]
Dimensions of the screws (2)
(min. 3 screws per plate)
≥
1.0 500 8 M14
(1) The increase in the number of screws for each plate makes it possible to proportionally increase the distance between the plates (a
double number of screws may allow a greater distance between the plates). In high stress areas (e.g. the rear spring supports, the tandem
axle springs and the air springs), it is necessary to provide a distance between the plates, reduced as much as possible.
(2)
In the presence of contained thicknesses of the plates of the chassis and the counter chassis, it is advisable to connect by adopting spacer
bushes, in order to use longer screws.
Mixed connection
Based on the indications in Chapter 3.1 (
➠
Page 5) for realisation of the counter chassis and the considerations of Chapter 3.3
(
➠
Page 11), the connection between the vehicle chassis and the reinforcing counter chassis may be of mixed type, i.e. obtained by
rationally using the elastic connections (brackets, clevis fasteners) and rigid connections (longitudinal and transverse sealing plates).
Generally, it is preferable to have elastic connections in the front part of the counter chassis (one or two per side), while connec-
tions are recommended with plates toward the rear of the vehicle when it the added structure requires a greater contribution to
the overall stiffness (e.g. tippers, cranes on rear overhang, etc.).
For this purpose, it is also possible to use connections by means of screws at the rear end of the chassis as shown in Figure 3.13.